Method of treating nickel-copper alloys.



UNITED STATESPATENT OFFICE,"

JOHN FAIBFIELD THOMPSON, OF BAYONNE, NEW JERSEY, ASSIGNOB 1'0 INTERNA- TIONAL mcxnr.

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company, or new YORK, n. 'Y., n conrona'rron or nnw .Jmnrnon on 'rnna'rmo nIcKnL-corrnn ALI-6Y8. I

No Drawing.

Specification of Letters latent. Patented J an, 18,1910, Application filed September a0, 1908." Serial No. 455,522. i

To all whom it may conc em:

Be it known that, I, JOHN FAIRFIELD THoMrsoN, of Bayonne, county of Hudson, and State of New Jersey have invented a new and useful Method 0 .-.Treat ing Nickel- Copper Alloys, of which the following is a specification. y v

My invention relates to nickel copper alloys and has for its object the removalof 10 the oxids of nickel and copperwhich form' thereon.

In rolling or forgin an ingot ofa copper nickel alloythe meta 'is first heated 1n a furnace and then drawn out and rolled or i forged into the desired shape. -Both during the heatin in the furnace and during the exposure'o the heatedmetalto the air during the rolling or forging operation the metal becomes covered with a coating of the oxids of the two metals. To remove the oxide of nickel andcopper,

especially those formed during the heating a and rolhngcor forging, I employ a. pickle. consisting of-a solution containing a ferric 26 iron salt. In the hue and has been rolled or for e merse it in a tank filled with a so ution con- 30 taining a free acid, preferably sulfuric acid and water. Ferric salt, preferably ferric.

sulfate, is then added to the-solution. The

- ferric salt if desired may be soluble in orm' when introduced into the bath.) The bath sa-is then heated to preferably about 150 F. c at: which temperature I have obtained the most satisfactory results.- The metal is allowedto remain in the bath until the oxids.

upon the metal are absorhedfin the solution; 4oand is then removed and washed.

The combination ofthe free acid in the. solution and the ferric salt act efl'ectiv'ely to remove the oxide of nickel and copper present on the surface of the metal, and a so i 5 act to prevent the; reprecipitatio'n by the o the copper dissolved from th Oxidnickel back upon the metal; a p

It Wlll be seen by those skilled in the art that many variations may be madein mv o process without departing from its spirit "and scope, since. a What I claim' is: I V

' 1. The-method of pickling nickel copper tank containing --and water, adding a ferric salt thereto, heat- Y substantially as described.

' alloys which consists intreating them with a heated acid solution containing a ferric iron salt; substantial] 'as described. j,- I 4. The herein described method of treat- 65 'ing nickel co per alloys for therinoval'of the oxide 0 nickel .and to per thereon, which consists in immersing t e metal m a a solution of a free acid ing the solution and thereafter removing,

the metal-and washing the same; substantially as described;

5.- The herein described m thod of treating nickel co per alloys for he removal of the. oxide 0 nickel and-copper vthereon,

which consists in immersing the'metal in a w t f tank containing, a solution of sulfuric acid referred form of operation, after the metal as been treated in the pro e;

and water, adding a; ferric'salt thereto, heat ing the solution and thereafter removing the metaland washing the same; substantially as described.

6. The herein described method of treating nickel co per alloys for the removal of the oxids 0 which consists in immersing the metal m a 1 7. The herein described method'of treating nickel copper alloys for the removal of the oxide 0 nickel and 'co per, which consistsin immersing the meta in a tank as containing] a solution of a free acid and water, adding a fer'ricsalt thereto,";heating the": solution to, 150 F., andjhereafter re-' moving the metal and washing the same;

. In testimony whereof, I have hereunto set-my'handr JOHN FAIRFIELD TIOIPSON. Witnesses? j Heana'a'r H. Cm, Tnos. H. Bun.

nickel and copper thereon, as, v 

